It is an oil that is widely used in light-duty gasoline engines. 5W-20 is a multigrade oil which means it ranges from a low viscosity grade of 5 to a higher viscosity grade of 20.

It is suitable for cars driven in cold climates, unlike oils with a higher hot temperature rating. Like 10 or 15, 5w20 oil can flow freely when the engine is started at low temperatures to coat and protect internal engine components.